| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -instcombine -S | FileCheck %s |
| |
| define i32 @factorize(i32 %x, i32 %y) { |
| ; CHECK-LABEL: @factorize( |
| ; CHECK-NEXT: ret i32 [[X:%.*]] |
| ; |
| ; (X | 1) & (X | 2) -> X | (1 & 2) -> X |
| %l = or i32 %x, 1 |
| %r = or i32 %x, 2 |
| %z = and i32 %l, %r |
| ret i32 %z |
| } |
| |
| define i32 @factorize2(i32 %x) { |
| ; CHECK-LABEL: @factorize2( |
| ; CHECK-NEXT: ret i32 [[X:%.*]] |
| ; |
| ; 3*X - 2*X -> X |
| %l = mul i32 3, %x |
| %r = mul i32 2, %x |
| %z = sub i32 %l, %r |
| ret i32 %z |
| } |
| |
| define i32 @factorize3(i32 %x, i32 %a, i32 %b) { |
| ; CHECK-LABEL: @factorize3( |
| ; CHECK-NEXT: [[Z:%.*]] = or i32 [[B:%.*]], [[X:%.*]] |
| ; CHECK-NEXT: ret i32 [[Z]] |
| ; |
| ; (X | (A|B)) & (X | B) -> X | ((A|B) & B) -> X | B |
| %aORb = or i32 %a, %b |
| %l = or i32 %x, %aORb |
| %r = or i32 %x, %b |
| %z = and i32 %l, %r |
| ret i32 %z |
| } |
| |
| define i32 @factorize4(i32 %x, i32 %y) { |
| ; CHECK-LABEL: @factorize4( |
| ; CHECK-NEXT: [[S:%.*]] = mul i32 [[Y:%.*]], [[X:%.*]] |
| ; CHECK-NEXT: ret i32 [[S]] |
| ; |
| ; ((Y << 1) * X) - (X * Y) -> (X * (Y * 2 - Y)) -> (X * Y) |
| %sh = shl i32 %y, 1 |
| %ml = mul i32 %sh, %x |
| %mr = mul i32 %x, %y |
| %s = sub i32 %ml, %mr |
| ret i32 %s |
| } |
| |
| define i32 @factorize5(i32 %x, i32 %y) { |
| ; CHECK-LABEL: @factorize5( |
| ; CHECK-NEXT: [[S:%.*]] = mul i32 [[Y:%.*]], [[X:%.*]] |
| ; CHECK-NEXT: ret i32 [[S]] |
| ; |
| ; ((Y * 2) * X) - (X * Y) -> (X * Y) |
| %sh = mul i32 %y, 2 |
| %ml = mul i32 %sh, %x |
| %mr = mul i32 %x, %y |
| %s = sub i32 %ml, %mr |
| ret i32 %s |
| } |
| |
| define i32 @expand(i32 %x) { |
| ; CHECK-LABEL: @expand( |
| ; CHECK-NEXT: [[A:%.*]] = and i32 [[X:%.*]], 1 |
| ; CHECK-NEXT: ret i32 [[A]] |
| ; |
| ; ((X & 1) | 2) & 1 -> ((X & 1) & 1) | (2 & 1) -> (X & 1) | 0 -> X & 1 |
| %a = and i32 %x, 1 |
| %b = or i32 %a, 2 |
| %c = and i32 %b, 1 |
| ret i32 %c |
| } |